smouch

例句：

1. 1. She gave a smouch of surprise when she heard the news.
   她听到这个消息时傻笑了。
2. 2. He chuckled at the absurdity of the situation.
   他对这种荒谬的情况傻笑起来。
3. 3. The old man had a smouch on his face as he walked past the children.
   老人经过孩子们时脸上露出了傻笑。